[sync] Cross platform sync tests to be run on Chrome on iOS buildbots

This patch adds a class of single client sync integration tests whose primary
purpose is to be run on the Chrome on iOS buildbots as part of cross platform
sync integration tests.

All tests in this class are disabled by default so that they don't run as part
of normal chromium buildbot runs. The DISABLED_ annotation will be overridden
when the tests are run on the Chrome on iOS buildbots.

TBR=thakis@chromium.org
BUG=b/6942067
TEST=Run cross platform tests on Chrome on iOS buildbots

Review URL: https://chromiumcodereview.appspot.com/10829227

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150456 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed